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Search Results: 1 - 10 of 1839 matches for " Soybean "
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Influence of low light intensity on growth and yield of four soybean cultivars during wet and dry seasons of northeast thailand  [PDF]
Anan Polthanee, Khanistha Promsaena, Anucha Laoken
Agricultural Sciences (AS) , 2011, DOI: 10.4236/as.2011.22010
Abstract: Crop is commonly grown in intercrop combinations of which cereal/legumes are the most widespread in tropical countries. The availability of low light inten-sity due to shading is the critical factor in determin-ing legume yield in intercropping. The experiment searches of better soybean cultivar for intercropping. A field experiment was conducted at the experimen-tal farm of Khon Kaen University in 2005. The objec-tives of this study were to determine the influence of light regimes (30% of normal light, 50% of normal light and normal light) on the growth and yield of four soybean cultivars (early, medium and late ma-turity) under artificial shading at 35 days after seed-ing until harvest in the wet and dry seasons. The re-sults showed that grain yield was significantly (p<0.05) decreased under the low light intensity at 30% of natural light both in wet and dry season. This was mainly due to low light intensity at 30% of natural light decreasing the number of pods per plant in the dry season. For cultivars, grain yield was sig-nificantly difference (p<0.05) among cultivars both in the wet and dry seasons. The cultivar KKU 74 (me-dium maturity) gave maximum grain yield both in wet and dry season under the low light at 30% of natural light. The KKU74 cultivar is better adapted to shading environment than other cultivars. This was due to the KKU74 cultivar produced higher chlorophyll b concentration in leaves after the plant experienced to shading. This physiological character can be used for soybean breeding program in shading tolerance. Therefore, the cultivar KKU 74 had a higher potential yield advantage in intercropping systems in which low light intensity is a major limit-ing factor on grain yield.
Evaluation of Delayed Glyphosate Burndown in No-Till Soybean  [PDF]
Kimberly D. Belfry, Christy Shropshire, Peter H. Sikkema
Agricultural Sciences (AS) , 2015, DOI: 10.4236/as.2015.63035
Abstract: Application of a preplant or preemergence glyphosate burndown is routine in most no-tillage production systems of annual crops, however, time of application may influence overall weed control and grain yield. Six field trials were conducted over a three-year period (2008, 2009 and 2010) near Ridgetown, Ontario, Canada to determine the effect of glyphosate burndown application timing in glyphosate-resistant (GR) no-tillage soybean [Glycine max (L.) Merr.]. Soybean growth was reduced 5%, 10% and 20% when the burndown was delayed to 1, 5 and 12 days after planting (DAP), when evaluated one week after application (WAA), respectively. By 8 WAA, predicted burndown timing increased to 9, 14 and 23 DAP, and was 10, 17 and 26 DAP at 12 WAA, to reduce soybean growth by 5%, 10% and 20%, respectively. Similarly, burndown application at 14, 21 and 30 DAP corresponded to a soybean yield reduction of 5%, 10% and 20%. Seed moisture content was generally insensitive to burndown timing; 80 and 140 DAP were required to increase moisture by 5% and 10%, respectively. This research indicates that delaying glyphosate burndown by up to 14 DAP, approximately VE to VC growth stage, has the potential to result in a modest reduction in soybean yield (5%).
Corn and Soybean Responses to Two Tillage Systems in a Cool Growing Season  [PDF]
Jesper K. V. Nielsen, Howard J. Woodard
Open Journal of Soil Science (OJSS) , 2015, DOI: 10.4236/ojss.2015.58016
Abstract: A field study in 2014 documented corn and soybean biomass and nutrient responses between conventional-till and no-till tillage systems at Beresford, SD during cooler than normal weather conditions with adequate soil moisture. The overall study was established in 1992. Each treatment plot was monitored weekly from June to August for soil moisture, temperature, and plant growth stages. Biomass was harvested during and at the end of the growing season for yield and nutrient content. Soil moisture measured throughout the early and middle part of the growing season was determined to be sufficient for crop growth, since precipitation was much greater than normal in June (33.2 cm). However, air temperature was below normal early in the growing season and lowered Growing Degree Days (939°C) compared to the 30-year average (139°C). Soil temperatures (5 cm depth) were not significant between tillage treatments in the corn plots during the growing season for 12 observation dates (range 16.3°C - 28.0°C). Plant growth was not significantly different between tillage treatments, reflecting the lack of soil temperature differences (5 cm depth) between tillage treatments. The mid-season plant tissue and crop residue at harvest nutrient content (P, K, and Zn) were not significant between tillage treatments. Corn grain yields were 10.3 T·ha-1 and 10.1 T·ha-1 for conventional tillage and no-till, respectively. Soybean grain yields were 3.9 T·ha-1?and 3.3 T·ha-1 for conventional tillage and no-till, respectively. These results would more than likely have been
Effect of Rice (Oryza sativa L.) Added to Meju (Korean Soybean Koji) Dough on Variation of Nutritional Ingredients and Bacterial Community Diversity in Doenjang (Korean Soybean Paste)  [PDF]
Bo Young Jeon, Doo Hyun Park
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.38154
Abstract: In this study, effect of rice added to meju dough was evaluated based on the variation of nutritional ingredients and bacterial community diversity in finished doenjang. The ratio of rice added to meju dough (cooked and crushed soybean before fermentation) was 0, 0.2, and 0.4 based on dry weight. Free amino acids, minerals, polyphenol, and total phenolic compounds relatively decreased by addition of rice. However, 2,2-diphenyl-1-picrylhydrazyl free radical (DPPH) scavenging and ferric ion reduction activity was not influenced. Organic acids, which are fermentation metabolites, significantly increased in proportion to percentage balance of rice. Seven and four volatile compounds (VCs) were detected in doenjang prepared without and with rice, respectively, and contents of VCs were significantly lower in the rice-supplemented doenjang. Bacterial community diversity was significantly increased by addition of rice to meju dough. Rice alters chemical composition, fermentation products, and bacterial diversity, but does not downgrade the nature of doenjang.
Peculiarities of CO2 exchange in soybean genotypes contrasting in grain yield  [PDF]
Jalal A. Aliyev
Advances in Biological Chemistry (ABC) , 2012, DOI: 10.4236/abc.2012.23039
Abstract: The peculiarities of leaf carbon dioxide gas exchange in soybean genotypes grown in field over a large area and contrasting in duration of vegetation, photosynthetic traits and productivity were studied. Varietal differences in the daily and ontogenetic changes in photosynthesis and photorespiration were identified. It was established that the period of the high activity of photosynthetic apparatus in high productive soybean genotypes lasts for a longer time. The photosynthetic rate and the rate of CO2 release in light due to photorespiration are higher in high productive genotypes. A value of photorespiration in contrasting soybean genotypes constitutes about 28% - 35% of photosynthetic rate. The ratio of gross photosynthesis to photorespiration in genotypes with different productivity is constant enough during ontogenesis, indicating a direct positive correlation between gross photosynthesis and photorespiration. Therefore, contrary to conception arisen during many years on the waste-fulness of photorespiration, taking into account the versatile investigations on different aspects of photo-respiration, it was proved that photorespiration is one of the evolutionarily developed vital metabolic processes in plants and the attempts to reduce this process with the purpose of increasing the crop productivity are inconsistent.
Potential Association between Soil and Leaf Chemical Properties, and Soybean Seed Composition  [PDF]
Luciano M. Jaureguy, Pengyin Chen, Kristofor Brye, Derrick Oosterhuis, Andy Mauromoustakos, John R. Clark
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.56059
Abstract:

Maximizing the expression of seed quality traits by understanding how they are affected by environmental variables may help develop high quality nutritious soybeans. Eight specialty soybean breeding lines were grown at two Arkansas locations differing by soil texture, with three replications in 2011. Before the reproductive period, soil and leaf samples were collected from each plot. Soil samples were analyzed for particle size distribution, electrical conductivity, pH, and a set of extractable nutrients from the top 12.5 cm, while leaf samples were analyzed for the same set of nutrients as the soil samples. At maturity, seed samples were analyzed for the same set of nutrients as were leaf and soil samples, plus protein, oil, fatty acids, and sugars. All leaf elements were within the adequate levels for soybean production at both locations. Overall, seed composition of breeding lines did not differ among locations and no significant changes in breeding line ranking among locations were observed. Attempting to modify seed composition by nutrient fertilization may not be profitable, as no direct relationships were observed between leaf or soil chemical properties, and seed composition. These findings may provide a starting point for future studies on fertilization and management practices that improve soybean seed quality.

Avalia??o de cultivares de soja [Glycine max (L.) Merrill] para o sul de Minas Gerais
Rezende, Pedro Milanez de;Carvalho, Eudes de Arruda;
Ciência e Agrotecnologia , 2007, DOI: 10.1590/S1413-70542007000600003
Abstract: in order to generate information to help scientists technicians and producers in the determination of cultivars to be grown in summer in lavras region, the present work was carried out at the experimental area of federal university of lavras, lavras, mg, brazil on a red latosol (lvdf), in 2002/2003 crop season. the experimental design was composed in randomized blocks with three replications. the 45 cultivars (treatments) used in the experiment were: doko, pioneira, virtuosa, conquista, ft-104, monarca, monsoy 108, monsoy 109, ft-abyara, performa, lideran?a, monsoy 8400, confian?a, splendor, ufv-16, garantia, renascen?a, iac-19, ft-2000, iac-21, cac-1, monsoy 8411, suprema, seguran?a, aventis 7002, paiaguás, carrera, santa rosa, brs-celeste, dm 339, brs carla, brs milena, brs mg 68 (vencedora), br-9 savana, aventis 2056-7, stte 02, aventis 1043, monsoy 8866, monsoy 8329, monsoy 9010, embrapa 48, emgopa 313, emgopa 314, tucano, brs 136. all cultivars showed good grain yields, specially brs mg 68 (4395 kg.ha-1), paiaguás (3897 kg.ha-1), aventis 2056-7 (3780 kg.ha-1), monarca (3646 kg.ha-1) and ft 2000 (3498 kg.ha-1). soybean plant and first pod height, taken by harvest time, was in the range of 0,68m to 1,53 m and of 0,08 m to 0,29m, respectively. lodging indexes were also satisfactory for all cultivars tested. seed quality of the cultivars were evaluated and ranged from 1,0 to 2,3 in a 1-5 scale.
Caracteriza??o de rizóbios (Bradyrhizobium japonicum) e produtividade da soja
LIMA, S.C.;LOPES, E.S.;LEMOS, E.G.M.;
Scientia Agricola , 1998, DOI: 10.1590/S0103-90161998000300003
Abstract: a field study on the competion and on the dynamics of occupation of nodulation sites by naturalized and seed inoculated strains of bradyrhizobium japonicum was conducted on a dark red latosol. the experimental design consisted of randomized blocks, with eight replications of the following treatments: a) control without inoculation; b) control without inoculation, with nitrogen fertilizer; c) inoculation with about 107 rhizobia/g (8g/kg of seed); d) inoculation with about 1010 rhizobia/g (8g/kg of seed). the inoculant was prepared with the strains sms-314 (= semia-587) and sms-463 (=semia-5019 = 29w), officially recommended for inoculant production. the identification of the strains which formed nodules was made in samples collected at 10, 42 and 70 days after seed germination. the grains were harvested to evaluate production and nitrogen content. sorological typification was made with antiserum prepared from antigens constituted by b. japonicum strains semia-587, semia-5019 and semia-5052 (=usda-6), using the immunodot method. the characterization of the strains in nodules revealed a small increase (6,2 to 8,7%) in the occurrence of nodules formed by the recommended strains for the three sampling dates. there was an expressive participation of the strain 5052 (serogroup usda-6) in the formation of the nodules. it was also observed that the naturalized strains may contribute differently to the formation of the nodules during the cycle, depending on the time of sampling.
Rhyssomatus subtilis Fiedler (Coleoptera: Curculionidae), primer registro para la Argentina y primera cita de planta hospedera, Glycine max (L) Merr.
Socías,M. Guillermina; Rosado-Neto,Germano H.; Casmuz,Augusto S.; Zaia,D. Gustavo; Willink,Eduardo;
Revista industrial y agr?-cola de Tucum??n , 2009,
Abstract: samplings of insects on soybean crops during 2005/2006, 2006/2007 and 2007/2008 seasons in northwestern argentina (nwa) led to the discovery of adults of rhyssomatus subtilis fiedler, 1937. this note is the first report of this species in argentina. in addition, soybean is reported for the first time as a host plant for this species in argentina.
The Evidence For Soybean Products As Cancer Preventive Agents
1 Mohamed E.M. Zowail, 2 Hanaa F. M. Waer, 2 Neamat Hanafi, 1 Eman H. S. Khater and3 Hala A.El-mancy
Egyptian Journal of Hospital Medicine , 2012,
Abstract: Aim of the work: The evidence for specific soybean-derived compounds having a suppressive effect on carcinogenesis in animal model systems is created, the anti-carcinogenic potential of soybean was studied against colon cancer. Colon cancer has been induced by dimethylhydrazine (DMH). Material and methods: The DMH was dissolved in physiologic saline and the animals were given subcutaneous injections once weekly for 16 weeks. The possible preventive effects of soybean on Dimethylhydrazine-induced colon tumors in male Sprague Dawley rats was investigated. Albino rats were divided into four groups. control group, control soybean powder group, DMH-treated colon cancer group and the fourth group treated with soybean powder+DMH. Results: In the studied groups the colon was examined macroscopilly to calculate the number of polyps appeared in each colon. The histological and ultrastructural studies included the alternations in different component of the colon. The macroscopical examination showed that the group which was given the soybean alone showed no polyps. On the other hand the group that was given the carcinogenic agent alone expressed a high number of polyps. The histological and ultrastructural studies showed that colon cell structure of carcinogenic treated animal groups underwent cell proliferation, focal cell damage with certain nuclear changes, abundance of fibrous tissue and lymphocytic infiltration, while the group given soybean as a preventive agent expressing less number of colon polyps, and induced a moderate changes of different degrees. Conclusion: It is clear that soy bean component showed a good protective effect against the colon cancer.
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